Synchronous Demodulator

TM 11-6625-524-14-2

5-8. Synchronous Demodulator

signal polarity. In this operation the collector

current is a function of collector voltage only, and

Transistors 3A2Q7 and 3A2Q8 are utilized in this

is essentially independent from other transistor

phase-sensitive rectifying circuit. The signal from

parameters. The voltage applied to the base of the

the output stage (3A2Q14) is compared with the

transistor acts o n l y a s a phase-sensitive

reference signal from 3A2Q5 and 3A2Q6. The

reference.

resultant dc output signal from this demodulator

has a polarity corresponding to the original input

Figure 5-5. Synchronous demodulator, simplified schematic diagram.

5-9. Driver

adjusted by 3A2R11. The frequency is factory

The driver, 3A2Q1 and 3A2Q2, is a two-transistor

adjusted to 94 Hz.

multivibrator circuit, the frequency of which is

Figure 5-6. Driver, simplified schematic diagram.

5-5